InhaltsangabeList of Figures. List of Tables. Preface. Acknowledgments. Part I: Information Retrieval on the Web. 1. Keyword-Based Search Engines. 2. Query-Based Search Systems. 3. Mediators and Wrappers. 4. Multimedia Search Engines. Part II: Data Mining on the Web. 5. Data Mining. 6. Text Mining. 7. Web Mining. 8. Web Crawling Agents. Part III: A Case Study in Environmental Engineering. 9. Envirodaemon. References. Index.